* fixed TypeError in settings which can be triggered when the settings
  are opened for the first time.

* added functionality to settings
* minor debug of annotation function

* rewritten populate and plot_subtime functions in graphtools
* rewritten autozoomy function
* slightly modified the update_spectrum function in __main__
* rewritted the peak picking function
* removed debug prints from the last commit

* changed layout of the QSettings
* added functions for intensity annotation and some memory of user
  preferences

* tmp folder now can be set in GUI, so rawprasslib functionality of
reading of the spectra during acquisition is implemented
* file is reloaded and the figures are refreshed upon F5